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        <title>Document</title>
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        <script>
            var minDistance = function (word1, word2) {
                let dp = new Array(word1.length + 1).fill().map(() => new Array(word2.length + 1).fill(0))
                for (let i = 0; i <= word1.length; i++) {
                    dp[i][0] = i
                }
                for (let j = 0; j <= word2.length; j++) {
                    dp[0][j] = j
                }
                for (let i = 1; i <= word1.length; i++) {
                    for (let j = 1; j <= word2.length; j++) {
                        if (word1[i - 1] == word2[j - 1]) {
                            dp[i][j] = dp[i - 1][j - 1]
                        } else {
                            dp[i][j] = Math.min(dp[i - 1][j] + 1, dp[i][j - 1] + 1, dp[i - 1][j - 1] + 2)
                        }
                    }
                }
                return dp[word1.length][word2.length]
            }
        </script>
    </body>
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